×

Pressure relief valve with pressure indicating means

  • US 4,232,698 A
  • Filed: 09/28/1978
  • Issued: 11/11/1980
  • Est. Priority Date: 09/28/1978
  • Status: Expired due to Term
First Claim
Patent Images

1. A pressure relief valve apparatus operatively attached to a high pressure cylinder for providing an indication of the pressure within the cylinder, said apparatus comprising in combination:

  • a. impedance means disposed within the pressure relief valve for providing an impedance representative of the pressure within the cylinder, said impedance means comprising a capacitor and including a flexible disc flexibly responsive to the pressure within the cylinder, said disc being electrically coupled as a positionable plate of said capacitor, said disc being rupturable in the event of a pressure rise within the cylinder above a predetermined value;

    (b) an end plate disposed in proximity to said disc in fixed relationship thereto, said end plate being electrically coupled as a fixed plate of said capacitor; and

    (c) means for sensing the impedance and providing an indication reflective of the pressure within the cylinder;

    whereby, movement of said disc relative to said end plate varies the impedance of said capacitor.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×